21876873 has 4 divisors (see below), whose sum is σ = 29169168. Its totient is φ = 14584580.

The previous prime is 21876871. The next prime is 21876901. The reversal of 21876873 is 37867812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21876873 - 2¹ = 21876871 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21876871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3646143 + ... + 3646148.

It is an arithmetic number, because the mean of its divisors is an integer number (7292292).

Almost surely, 2^21876873 is an apocalyptic number.

It is an amenable number.

21876873 is a deficient number, since it is larger than the sum of its proper divisors (7292295).

21876873 is an equidigital number, since it uses as much as digits as its factorization.

21876873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7292294.

The product of its digits is 112896, while the sum is 42.

The square root of 21876873 is about 4677.2719613039. The cubic root of 21876873 is about 279.6802174045.

The spelling of 21876873 in words is "twenty-one million, eight hundred seventy-six thousand, eight hundred seventy-three".